;; https://projecteuler.net/problem=35


;; Circular primes
;; Problem 35

;; The number, 197, is called a circular prime because all
;; rotations of the digits: 197, 971, and 719, are
;; themselves prime.

;; There are thirteen such primes below 100: 2, 3, 5, 7, 11,
;; 13, 17, 31, 37, 71, 73, 79, and 97.

;; How many circular primes are there below one million?
